This
expression is similar to "what goes around, comes around" and basically means that the
consequences of one's evil actions catch up in a negative way. The idea that a wrongful curse comes back to the one who curses as a "bird returns to its nest" dates back
to the days of antiquity. However, it wasn't until the 19th Century that Robert Southey wrote that "curses are like a young chicken: they always come home to roost." Since then, the idea of evil men creating returns to their own door has been encapsulated in this expression.
Dude, you keep dealing drugs and you're going to get caught.
When the chickens
come home to roost, they will take your car,
your house, and all your money!